Unfortunately we can't see the insects clearly enough to ID them, and identification to genus or species level often requires a microscope. You can ask the Montgomery County Extension office if they can accept samples (to the best of our knowledge, they do, but you may need to coordinate with them as to timing), and we think they have access to a microscope there. One of the insects on the sticky trap looks like a beetle, and the other like a small wasp (not a type that can sting - in fact, many in this group are beneficial because they prey on pests).

There are several species of beetles that can be indoor nuisance pests, only a few of which damage anything outside of stored foods. All of them can fly as adults, and any indoor insect can be attracted to light sources (lamps or windows) because, in nature, a light source in a dark area (our homes are fairly dark compared to outdoor ambient light) is a means of escape. Some indoor beetles that can infest stored foods can also feed on non-food items, or items stored in the nest material of a wild animal (such as a rodent's cache of seeds if they are residing in a wall or ceiling void). The primary beetle group in this category (which are not accurately named for their primary food source) are carpet beetles, cigarette beetles, and drugstore beetles.

The larvae of carpet beetles chew on natural fibers like wool and fur, which can include clothing, rugs, taxidermy specimens, feathers, pet or human hair trapped in air vents (etc.), dead animals (if a wild animal died in a wall or attic), and so forth. The linked page has more info., and the University of Kentucky page it connects to has a lot more detail. A common species of carpet beetle encountered by people looks like the multi-colored, more rounded species pictured on that page, but other species can be more uniformly brown-black and have a slightly different body shape.

Cigarette and drugstore beetles look similar to each other and feed on items like tobacco/cigarettes, seeds, grain, nuts, beans, potpourri, dry pet food, dried spices, cottonseed meal, dried fruits and vegetables, flour, old rodent bait, and dried plant material (like dried flowers). The linked page has more detail.

Khapra beetles are another stored-grain pest, and their favored foods include rice, wheat, and barley. As with the beetles above, they might not be in your pantry if you've already inspected stored food items and found them pest-free, but they might be coming from another source of food, such as an in-wall rodent food cache. We doubt the insects are coming into the home from behind the light fixture; rather, they are probably flying up to the light trying to leave and getting confused, trapped, and dying in or around the fixture.

Miri

You're welcome.
Some pest control companies have their own entomologists on-staff, or they can submit samples to other diagnostic labs in the area. The UMD entomology dept. typically is not able to accept samples, but a simple first step may be to bring samples (ideally not stuck to a sticky trap, because that obscures some of the physical features needed for ID -- the observer will need to be able to move the insect around to view all sides) to the local Extension office and see what they can determine, either in-house or in consultation with UMD entomologists who they might be able to pass the sample along to. You might be able to collect a few dead, intact beetles either from the light fixture or a windowsill.

Miri

You're welcome.